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After all the suggestions, this is what i got up to. Trying to introduce a rainbow reflection map into the material but it doesnt give the desired result. You can see the colour spectrum in it but its not scattered. I may need to take it into Photoshop to get that depth in the shadows. My main concern now is the table of the stone where it doesnt look right.

I tried the advance background setting but it only applies to the overall scene. I think we need to isolate to just the material. So we can get the different colours in it.

I bumped the relectivity and refractivity to 12 and this is the result, i like where this is going, but we also have to consider that gems are usally placed in shiny metal, which may become too reflective so we have to be careful of that

I don't have any really colourful HDRI to try for the refraction, at the moment unfourtunatly.

Normally it would be there, but it does nto see you have the latest build.

There is another additional trick. The Advanced Background button at the btton of the panel you show. You can go in there and tell NXT to use a different HDRI for reflection and refraction. You could experiment with using colorful HDRIs in those locations to see if you can fire up the diamond. I would experiment with the refraction option.

This is the model. Thanks for looking into this. I am trying to figure out ways to create better renderings of Gems using Nxt. The plugin is awesome and it is intuitive. I am currently lecturing a group of jewellery design students in rhino and would like to use nxt as the rendering component. Thanks again.

I just had a Quick Look, your Crystal/Diamond Material is too clear, and it seems like your HDRI is a bit too Bright and it washes eveything out it needs more contrast, Im switching up the crystal/Diamond material and Changing the HDRI and i'll do a couple of renders and post them in an hour or so, (lunch time here)

I've only seen one or two almost perfect renders of diamonds ever, it is one of the hardest materials to render just because of the fire.

Gems on the otherhand once you get a base model, all you really need to do to switch them is change the colour a bit and the dispersion/translucency and it looks fine

Best of luck with your class.

If you need something specific I may have some HDRI and Materials that might help.